02-12-2010, 03:12 AM
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Sorry to hear about your fish. :(((
I'll try to answer anyways... One time, I went to petsmart, and all the males in the fish tank were chasing this one fish. Well, the guppy appeared to be female, and all the males were chasing her. It was very dull and drab just like a female, and I was pretty sure it had a fan-shaped anal fin. I told them (I was looking to buy 2 females), because I felt bad that it was getting raped constantly by the 20ish males in the tank, so I bought it. For a 1.49$ that the females are (males are 3$)... then after a few weeks it like magically transformed into a male, it was very weird. Now it's a nice looking black male, with a huge body (about the size a female would be) and has a pretty big black back fin. And red/blue spots on the side underneath his side fins. Anyways, the "male" I bought was about 1.5 inches long (you'd think it'd be sexually mature...) so I am suprised it turned out to be a male...
Anyways, my point is... I guess some guppies can develope really late, almost when they are full grown. Most guppies I believe will develope their gonopodium around 0.75 inches to 1 inch from mouth to end of tailfin. I haven't had many baby guppies for a long time, but about 2-3 years ago I had some, and that's about when they started to look like males and developed their gonopodium. I currently have only one baby guppy at about 0.75 inches long. Don't know what it is yet.